I want create a layout, with a horizontal LinearLayout(s) on top and bottom, a ListView fill in middle.

How can I define the main.xml.

I tried to create a layout with horizontal LinearLayout on top, TextView on bottom, a ListView fill in middle; is ok. But after I modified the bottom TextView to LinearLayout, the bottom LinearLayout disappear.

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    >
    <LinearLayout 
        xmlns:android="http://schemas.android.com/apk/res/android" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:orientation="horizontal"
        >
        <TextView 
            android:textSize="12px" 
            android:text="something here" 
            android:layout_width="50px" 
            android:layout_height="wrap_content"
            /> 
        <TextView 
            android:textSize="12px" 
            android:text="something here" 
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content"
            />
    </LinearLayout> 

    <LinearLayout 
        android:orientation="vertical" 
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent" 
        android:gravity="bottom" 
        >
        <ListView 
            android:id="@+id/listbody" 
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content"
            />
        <LinearLayout 
            android:orientation="horizontal" 
            android:layout_height="wrap_content" 
            android:layout_width="fill_parent" 
            > 
            <TextView 
                android:layout_height="wrap_content" 
                android:layout_width="0dip" 
                android:layout_weight="1" 
                android:textSize="12px" 
                android:text="50%" 
                /> 
            <TextView 
                android:layout_height="wrap_content" 
                android:layout_width="0dip" 
                android:layout_weight="1" 
                android:textSize="12px" 
                android:text="50%" 
                /> 
        </LinearLayout> 
    </LinearLayout> 
</LinearLayout>

Anybody can tell advise? Please help.